A PIC C Code Wizard

// CCP1.cpp : implementation file
//

#include "stdafx.h"
#include "piccpc.h"
#include "CCP1.h"
#include <math.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CCCP1 property page

IMPLEMENT_DYNCREATE(CCCP1, CPropertyPage)

CCCP1::CCCP1() : CPropertyPage(CCCP1::IDD)
{
	//{{AFX_DATA_INIT(CCCP1)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
}

CCCP1::~CCCP1()
{
}

void CCCP1::DoDataExchange(CDataExchange* pDX)
{
	CPropertyPage::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCCP1)
	DDX_Control(pDX, IDC_CCP1_DC, m_cCCP1DC);
	DDX_Control(pDX, IDC_CCP1_MODE, m_cCCP1Mode);
	DDX_Control(pDX, IDC_CCP1_FREQ, m_cCCP1Freq);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CCCP1, CPropertyPage)
	//{{AFX_MSG_MAP(CCCP1)
	ON_CBN_SELCHANGE(IDC_CCP1_MODE, OnSelchangeCcp1Mode)
	ON_CBN_SELCHANGE(IDC_CCP1_FREQ, OnSelchangeCcp1Freq)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCCP1 message handlers

BOOL CCCP1::OnKillActive() 
{
	if ( !CPropertyPage::OnKillActive() )
		return FALSE;

	int i = m_cCCP1Mode.GetCurSel();
	if ( i )
		i += 3;
	PICInfo.sfr.CCP1CON &= 0xF0;
	PICInfo.sfr.CCP1CON |= i;
	PICInfo.sfr.PIE1 &= 0xFB;
	PICInfo.sfr.PIE1 |= (IsDlgButtonChecked(IDC_CCP1_INTERRUPT)<<2);
	// assign pwm dc
	int dc = m_cCCP1DC.GetCurSel();
	PICInfo.sfr.CCPR1L = (dc>>2);
	PICInfo.sfr.CCP1CON &= 0xCF;
	PICInfo.sfr.CCP1CON |= ((dc&0x0003)<<4);
	return TRUE;
}

BOOL CCCP1::OnSetActive() 
{
	int i = PICInfo.sfr.CCP1CON&0x0F;
	if ( i ) {
		i -= 3;
	}
	m_cCCP1Mode.SetCurSel( i );
	OnSelchangeCcp1Mode();
	CheckDlgButton( IDC_CCP1_INTERRUPT, PICInfo.sfr.PIE1&0x04 );
	UpdatePWMFreq();
	UpdatePWMDC();
	return CPropertyPage::OnSetActive();
}

void CCCP1::UpdatePWMFreq( void ) {
	CString s;
	m_cCCP1Freq.ResetContent();
	for ( int i=0;i<256;i++ ) {
		double f = GetPWMFrequency( i );
		if ( f > 1000.0 ) {
			s.Format( "%G KHz", f/1000.0 );
		}
		else {
			s.Format( "%G Hz", f );
		}
		m_cCCP1Freq.AddString( s );
	}
	m_cCCP1Freq.SetCurSel( PICInfo.sfr.PR2 );
}

void CCCP1::UpdatePWMDC( void ) {
	// set PWM freq and duty cyle;
	int dc = m_cCCP1DC.GetCurSel();
	if ( dc > -1 ) {
		PICInfo.sfr.CCPR1L = dc>>2;
		PICInfo.sfr.CCP1CON |= ((dc&0x0003)<<4);
		PICInfo.sfr.PR2 = m_cCCP1Freq.GetCurSel();
	}
	CString s;
	m_cCCP1DC.ResetContent();
	int n = (int)(pow( 2, GetPWMDCResolution() ));
	for ( int i=0;i<n;i++ ) {
		double f = GetT2Prescaler()*i*(PICInfo.dInstructionTime/4.0);
		f = (f/(1.0/GetPWMFrequency(PICInfo.sfr.PR2)))*100.0;
		s.Format( "%G%%", f );
		m_cCCP1DC.AddString( s );
	}
	if ( n < 1024 )
		m_cCCP1DC.AddString( "100%" );
	dc = 0;
	dc |= (PICInfo.sfr.CCPR1L<<2);
	dc |= (PICInfo.sfr.CCP1CON&0x30)>>4;
	--n;
	m_cCCP1DC.SetCurSel( dc&n );
	UpdatePWMInfo();
}

void CCCP1::UpdatePWMInfo( void ) {
	CString s;
	double res = GetPWMDCResolution();
	s.Format( "NOTE: to modify frequency range, "
		"change Timer 2 Prescaler.\n"
		"Actual tmr2 prescaler: %G\nDuty cycle resolution: %G-bit", GetT2Prescaler(), res );
	SetDlgItemText( IDC_CCP1_INFO, s );
}

double CCCP1::GetPWMDCResolution( void ) {
	double r = log(PICInfo.dwOSCFrequency/GetPWMFrequency(PICInfo.sfr.PR2))/log(2);
	if ( r > 10.0 )
		r = 10.0;
	return r;
}

double CCCP1::GetPWMFrequency( int dc ) {
	double f = (dc+1)*PICInfo.dInstructionTime*GetT2Prescaler();
	return 1.0/f;
}

double CCCP1::GetT2Prescaler( void ) {
	double t2p = 16.0;
	switch ( PICInfo.sfr.T2CON&0x03 ) {
	case 0:
		t2p = 1.0;
		break;
	case 1:
		t2p = 4.0;
	}
	return t2p;
}

void CCCP1::OnSelchangeCcp1Mode() 
{
	if ( (m_cCCP1Mode.GetCurSel()+1) == m_cCCP1Mode.GetCount() ) {
		GetDlgItem(IDC_CCP1_FREQ)->EnableWindow();
		GetDlgItem(IDC_CCP1_DC)->EnableWindow();
		CheckDlgButton( IDC_CCP1_INTERRUPT, 0 );
		PICInfo.sfr.T2CON |= 0x04;
	}
	else {
		GetDlgItem(IDC_CCP1_FREQ)->EnableWindow( FALSE );
		GetDlgItem(IDC_CCP1_DC)->EnableWindow( FALSE );
		CheckDlgButton( IDC_CCP1_INTERRUPT, 1 );
		PICInfo.sfr.T2CON &= 0xFB;
		if ( m_cCCP1Mode.GetCurSel() == 0 )
			CheckDlgButton( IDC_CCP1_INTERRUPT, 0 );
	}
}

void CCCP1::OnSelchangeCcp1Freq() 
{
	UpdatePWMDC();
}